cri·te·ri·on

[krahy-teer-ee-uhn]
noun, plural cri·te·ri·a [-teer-ee-uh] , cri·te·ri·ons.
a standard of judgment or criticism; a rule or principle for evaluating or testing something.

Origin:
1605–15; < Greek kritḗrion a standard, equivalent to kri- variant stem of krī́nein to separate, decide + -tērion neuter suffix of means (akin to Latin -tōrium -tory2)

cri·te·ri·al, adjective

criteria, criterion (see usage note at the current entry).


measure, touchstone, yardstick. See standard.


Like some other nouns borrowed from the Greek, criterion has both a Greek plural, criteria, and a plural formed on the English pattern, criterions. The plural in -a occurs with far greater frequency than does the -s plural: These are the criteria for the selection of candidates. Although criteria is sometimes used as a singular, most often in speech and rather infrequently in edited prose, it continues strongly in use as a plural in standard English, with criterion as the singular.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Criteria is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a fool or simpleton; ninny.
Collins
World English Dictionary
criterion (kraɪˈtɪərɪən) [Click for IPA pronunciation guide]
 
n , pl -ria, -rions
1.  a standard by which something can be judged or decided
2.  philosophy a defining characteristic of something
 
usage  Criteria, the plural of criterion, is not acceptable as a singular noun: this criterion is not valid; these criteria are not valid

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

criterion
1660s, from Gk. kriterion "means for judging, standard," from krites "judge."

criteria
1620s, plural of criterion (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
While not ideal, there is one criteria that seems to identify a high percentage
  of visual dyslexics.
Employees in stores that meet specific criteria, such as profitability and
  customer satisfaction, share in yearly profits.
There will be, however, no absolute agreement upon either the corrections or
  the criteria by which they were made.
But there are no fixed criteria and no clear rewards.
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